Two-way repeater and amplifier



3 5 0 00 5 :w una R E U A X E 5 5 W Och 26,1925

Two-WAY HEPEATER AND AMPLIFIER Filed ma. '25. 19

Patented .01ct. 20, l

A UNITED STATES PATENT oFF-1er..

WILL G. SEXAUER, F SAN ANTONIO, TEXAS.

TWO-'WAY REPEATER AND AMPLIFIER.

Application filed-January 25, 1923-.. Serial No. 614,875.

To all whom it may cemcem:

Be it known that I, WILL G. SnxAu-En,

u citizen of the United States, residing at San Antonio, in the county of Bexar and State of Texas, have invented certain new and useful Improvements in Two-Way Repeaters and Amplifiers, of which the following is a specification.

This invention relates to a'two-way re- `peater and amplifier of voice currents.

former is connected to the grid circuit ofA the tube, and the plate circuit of the tube isi-connected to the primary winding of the output transformer.' The lsecondary winding of the output transformer isl connected across the line at the mid points of the spl it primary coil of the input transformer.

The balancing arrangement is such as to balaneeboth sides of the circuit beyond the mid points of the primary of the input transformer.

A feature of the invention 1s that the clevice is portable and of simple construction.

Another feature is the provision for a loud speaker and supervision connections.

Another feature is that it -may lie-operated on various types of circuits, at a ter-A minal or any point between :the terminals. An additional featur' is that if the vacuum tube burns out during a conversation through the circuit, there is no interruption of the conversation.

Another feature is that the set maybe used on different circuits as desired, being readily adjustable to the particular circuit.

Other useful and novel features will be set forth in the'description following, Itaken in connection with the drawings attached hereto and as follows:

The ligure shows a top-or plan view of the invention.

Referring to said figure, with the repeater at any point in a circuit, voice currents from 'either direction entering on line 1,

at points A or B, pass through primary coils 3 and- 3", thence to line 2 at points A orB,

through the other half of the primary coils 4 and 41. The currents in passing through coils 3-3a-4 and 4 4are induced into coil 5, the secondary winding and introduced into the grid circuit of the vacuum tube at a suitable potential for excitation. Due to the construction of the exciting transformer, which is of suitable material and design, the proper amount of energy is taken from the line. The currents from coil 5 are carried o n lines 0,-() and D-D to the grid circuit.

Battery' 6 maintains the grid at a suitable potential for excitation. Battery No. 11 lights the-filament 9, being controlled by rheostat 10. The grid circuit extends from coil 5, through line C, to battery 6, to grid 8, to filament 9, thence to line D, returning to the other side of coil 5. The currents, in passing through the id circuit, cause the plate circuit to function and reproduce the currents at an amplified value. The plate -circuit extends from plate 7 to filament 9,

thence on line E to coil 13,-primary wind'- ing of the output transformer, and from coil 13 on line F, through battery 12, to plate 7 From the primary 13 of the output transformer, the currents are transferred to coil 14, the secondary winding. The output transformer is designed and constructed to bring about the proper transforu'lation for introducing the amplified currents back into the line. From coil 14 the currents are ried into the points X and Y, the mid p oints of the primary windings of the exciting transformer. Froln points X and Y the currents flow in both directions. lVhen the balancing arrangement K-lS-lQ--L and I-16-17.J are adjusted to balance both" sides of the completed circuit beyond the points X and Y, the currents in dividing tend to neutralize the effect of coils 3, V3, 4,

4 upon coil 5. In this manner the tube' is controlled and prevented from howling or singing.

The reversible switch 15 is used to connect the coil 14 in proper manner to points X and Y of the input transformer. Lines M and N from the switch 15, comprise-the connection for a loud speaker or supervision circuits, as d siret?.

What .is claimen is:

1. In a two-way repeater and amplifier of voice currents, an input transformer, sin output transformer, one of said transformers having a pair of primary coils connectedrespectively .to two lines, means for conf 1 ers having a pair of primary coils connected respectively to two linesjmeans for connecting each of the pair of coils to the secondary coil of the companion transformer and including a double switch, a vreceiving instrument connected to the latter, a vacuum 15 tube having a grid, plate and filament therein connected in circuit with the secondary coil of the transformer which has the pain iplimaryoils and with the primary coil.

of thecoinpanion transformer, and variable 20 balancing circuits on theV remote' sides of the transformers. I

' In testimony whereof I have signed my name to this specication.

WILL G.- SEXAUER. 

